Artikelen april 2016

Moderately inflated valves; three anterior sulci and one posterior sulcus reaching from beaks to ventral margin; concentric sculpture of erect lamellae with numerous secondary concentrics in each interspace; and prosogyrate umbos projecting above the shell body. 

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Hydropoliep. Marine soort. Klein kwalletje. De paraplu is enigszins afgevlakt en kan een diameter van 25-35 mm lang. Het heeft vier radiale kanalen. De maag reikt iets onder de paraplu, die een groot aantal korte, marginale tentakels heeft. De maag, geslachtsklieren, en de basis van de marginale tentakels zijn allemaal gekleurd licht sepia.

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Massive yellow to orange encrusting sponge with a convoluted apearance. The surface is often covered by substrate or algue. Fills cavities in reefs and grows in sand and rubble. Lives at 20 m or deeper.

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Gray or black globular sponge with often a spiky surface. May have shallow depressions on upper side.

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Reddish brown to orange sponge with lighter colors around the raised openings. Openings may form tubes of maximum 10 cm height.  The sponge is encrusting but may form irregular branches.

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Massive smooth tubulate sponge with rounded top. Grows in clusters, tube walls may be fused. Greyish brown to orange or pink. The broad rims of the opening typically lighter. 

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Borstelworm. Mariene soort.

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Borstelworm. Mariene soort.

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Zoetwater vlokreeft.

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